Monitoring of C-reactive protein using ion sensitive field effect transistor biosensor

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Monitoring of C-reactive protein using ion sensitive field effect transistor biosensor
H J Park; S K Kim; Kyoung Sook Park; So Yeon Yi; J W Chung; Bong Hyun Chung; Moonil Kim
Bibliographic Citation
Sensor Letters, vol. 8, no. 2, pp. 233-237
Publication Year
An ion sensitive field effect transistor (ISFET) as a transducer, more precisely an immunologically modified-FET (immuno-FET) device, was utilized for the detection of the C-reactive protein (CRP), a potent marker for inflammation or cardiac risk. The ISFET biosensor investigated in this study was fabricated via a standard CMOS process. Anti-CRP monoclonal antibody was covalently attached to the gate surface using the self-assembled monolayer (SAM) method. The response of anti- CRP antibody to CRP was evaluated via the measurement of the electrical features of the ISFET device. As a consequence, a considerable reduction in drain current was clearly noted upon CRP binding to anti-CRP antibody on the gate, which can be explained by the charge effect, in which negatively charged CRP is predominantly responsible for the current drop in the n-type ISFET. The FET measurement was also verified by surface plasmon resonance (SPR) analysis. Collectively, our data convincingly showed that the FET-type biosensor is potentially applicable to the detection of CRP via antigen-antibody binding events on the gate surface.
Antigen-antibody interactionBiosensorC-reactive proteinImmuno-FETISFET
American Scientific Publishers
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Critical Diseases Diagnostics Convergence Research Center > 1. Journal Articles
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